The surgery is well recorded. The years after are not.
The Netherlands keeps careful track of how safe the procedure itself is. But what comes afterwards, years later, largely falls out of view. On this page we turn the numbers around: not what they show, but what they miss.
The short term looks favourable
The Dutch registry DATO does its job well on the part it measures. Since 2015 all bariatric centres have supplied their data.
100%
of bariatric centres in the Netherlands supply data to the national registry DATO.
1.6%
serious complications around the operation, considered above average good in Europe.
45,000+
registered procedures since the registry started in 2015.
What is recorded, and what falls away
Put side by side what the system records neatly and what systematically falls outside it. The right-hand column is where many people get stuck years later.
What is recorded
- Complications during and shortly after surgery
- Length of stay in hospital
- Weight loss in the first year
- Reoperations and revision procedures
- Improvement of diabetes within one year
What falls away
- Dumping and eating problems that only flare up after years
- Vitamin and mineral deficiencies that build up
- Mental health complaints under a different diagnosis
- Complaints that land with the GP or another specialist
- Everyone who stops coming to check-ups after a few years
The people disappear from the numbers
The guideline advises at least five years of monitoring. But participation drops every year, precisely in the period when late complaints arise.
Five years of follow-up is advised in the guideline, but if more than half are already out of view after three years, the long term stays a blind spot. Anyone who develops a complaint after years is often no longer a data point.
Mental health complaints get a different label
The registry measures quality of life around the operation. But a depression or burnout that falls years later gets its own diagnosis. No one links it back to the gastric bypass.
Separate records
Bariatric centre, GP and mental health care work in separate systems. A complaint elsewhere does not come back to the operation by itself.
A different label
If it becomes "depression" or "burnout", that is how it stands in the records. The role of the procedure is rarely recorded.
No adding up
Each piece is correct on its own. But no one adds up all the complaints together. That is where people fall through the cracks.
"In my case it was recorded as depression and burnout. Both correct. But that the bypass played a part, no one wrote that down, and it is in no statistic."
"Safe" is true, but narrow
This is not an argument against the operation. The procedure helps many people. It is about what you can and cannot conclude from the numbers.
Safe, but narrowly measured
The numbers show that the operation is performed safely. Not that the years afterwards are trouble-free. That research largely does not exist.
Absence is not proof
That late and mental health complaints appear little in the numbers does not mean they are rare. It can also mean they are not being measured.
Ask your doctor
Use this to ask questions before you choose: what does monitoring look like in five years, and who keeps an eye on the whole then?
Where these figures come from
Registry, complications and participation (DATO / DICA)
Follow-up: 76% after 1 year, 48% after 3 years
Advice of at least 5 years of monitoring
🏎 Need help right now?
If there is immediate danger to yourself or someone else: call 112. Feeling low or having thoughts of suicide? In the Netherlands you can call or chat day and night with 113 Suicide Prevention via 0800-0113. Outside the Netherlands, contact your local emergency line.